LoadTransformation error

My site got broken and showing error [CMSDataProperties.LoadTransformation]: Transformation 'cms.file.wheretobuystoredivstart' not found. But I have not made any changes to the site for past one month.

Its possible that in some places the transformation name was changed in the web parts, but in other places you still need to update the web parts. If you dont have too many templates that use that web part with that transformation you shouldnt have a problem doing it manually. If You have a lot of templates that use that web part, you may be able to write a SQL update.